低能电子离化氢原子的三重微分截面

Low-energy triple-differential cross sections for electron impact ionization of hydrogen

运用修正后的BBK理论计算了入射能近阈值的情况下 (E0 =30、2 5、2 0、17.6和 15 .6eV) ,共面等能、两个出射电子相对角取不同固定值时电子入射离化氢原子的三重微分截面 (TDCS) ,所得结果与实验进行比较 ,符合较好。指出 :对 3C波函数进行索末菲参量的修正是成功的 ,这一修正使得BBK模型也能对入射能近阈值的低能 (e,2e)过程给出很好的描述。

In this paper, the modified BBK theory is applied to electron-impact ionization of atomic hydrogen at incident energies of 30, 25,20,17.6 and 15.6 eV. The triple-differential cross sections (TDCS) are presented for the case of equal energy sharing of the excess energy. The calculated TDCS are generally in good agreement with experiment. It is showed that the BBK model which is modified by the introduction of effective Sommerfeld parameters can also give a good description of the low-energy (e,2e) processes.